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No, the correct way is to use the global function isNaN(x);

See the following comment: http://news.ycombinator.com/item?id=4530557 The reason why some of them is so fast is because the constant expression is evaluated to a constant, so inst…

-0+'12' (and 0+'12') doesn't convert it to a number, it converts the zero to a string and then concatenate them to the string "012". And Firefox optimize it: Function('return -0+"1…

The reason why the wicked is so fast in Firefox is because of the literal string and the optimizations done by the compiler. Try this (creates a function and then show the source):…